Additives
If you can get Shell V Power high octane, you don't need additives. In Europe I always get the highest octane fuel... plain French/Spanish cheapest supermarket petrol results in slight spluttering at speeds over 110 kph as the computer doesn't like it. At 130 kph, you'd think the there's something very wrong with the engine.
Honest John always recommends V Power but it costs another 8-10p/litre = £6 for a tank, which is what a whole can/bottle of additive costs, when you only are advised to put a little in with each tankful.
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